Teac Corporation

Mitsubishi Electric Corporation

Hidehiko Murata

Akira Mashimo

Kyosuke Yoshimoto

Hiroyuki Onda

Takuya Nagata

Kazuhiko Nakane

Teruo Furukawa

Minoru Ozaki

Yoshihiro Kiyose

Yutaka Kobayashi

Koji Yamana

Kohji Yamana

Gui Changhao

Seiichi Ohnuki

A rotating disk data storage device havIng a buffer in the form of a semiconductor memory for temporarily storing data supplied from a host computer prior to transfer to a disk drive. For most efficient data transfer from buffer to disk, the storage device has a microprocessor controller which is preprogrammed to compute the average, or weighted average, of the time intervals at which at least three, preferably eight, latest consecutive data blocks are delivered from the host, the average being updated with the reception of each new data block from the host. The data is transferred from buffer to disk at time intervals each determined by multiplying the latest average time interval by a preselected coefficient. Data transfer from buffer to disk also occurs when the time interval between any two consecutive data blocks exceeds a predetermined limit, or when the amount of data stored in the temporary memory exceeds a predetermined limit.

Peripheral data storage device in which time interval used for data

A method for rewriting four defect management areas on an optical disk according to an ECMA standard is performed by means of deleting an old data which has been recorded on the respective defect management areas and then sequentially writing down a new data on respective defect management areas.

Method for rewriting defect management areas on optical disk according

An optical or magneto-optical disk storage which automatically adjusts a recording/reproducing level of a number of kinds of optical or magneto-optical disks having different recording/reproducing levels to an optimum recording/reproducing level. The optical or magneto-optical disk storage has an attenuator which applies a predetermined attenuation amount to a reproduced signal reproduced from an optical or magneto-optical disk so as to attenuate the reproduced signal, or intensity adjusting means for adjusting the intensity of a laser beam used for recording and/or reproducing. The optical or magneto-optical disk storage detects an amplitude of the reproduced signal and feed-back-controls the attenuation amount or intensity of the laser beam in accordance with the detected amplitude.

Disk storage which automatically adjusts to optimum

Growing community of inventors

Niiza, Japan

Hidehiko Murata